Conference paper (2014) - J. Popovic (author), Jelena Popovi¿ (author), J Popovic-Gerber (author), J. Popovi¿ (author), Jelena Popovic-Gerber (author), J Popovi¿ (author), J. Popovic-Gerber (author), J. Gerber-Popovic (author), J Popovic (author), Jelena Popovic (author), J Gerber-Popovic (author), Jelena Gerber-Popovic (author), Bram Ferreira (author), J. A. Ferreira (author), J. A. Ferreira (author), Braham Ferreira (author), JA Ferreira (author), J.A. Ferreira (author), Jan A. Ferreira (author), JA Ferreira (author), J.A. Ferreira (author), Jan Abraham Ferreira (author), Jan Abraham Ferreira (author), Jan A. Ferreira (author), Braham Ferreira (author), Bram Ferreira (author), JD van Wyk (author), F Pansier (author)